Nyiragongo: a deep dive into the world's most dangerous lava lake
Nyiragongo is the volcano that proves you should not stand near very fluid lava. Its summit crater holds the largest permanent lava lake on Earth, and its flanks — when they crack open — produce some of the fastest-flowing lavas ever recorded. The city of Goma, on Lake Kivu fifteen kilometres south, has been overrun twice in living memory.
A stratovolcano with unusual chemistry
Nyiragongo (3,470 m) sits in the Virunga Mountains of the East African Rift, on the border of the Democratic Republic of the Congo, Rwanda and Uganda. Its lavas are ultra-alkaline and unusually silica-poor — fluid as motor oil at eruption temperature, which lets them flow at speeds others can only manage downhill on glass.
The lava lake
A more or less continuous lava lake has occupied the summit crater since the early twentieth century. It drains and refills on its own schedule. At its highest, the lake sits a few hundred metres below the crater rim; visitors who reached the rim by guided trek looked straight down into red, churning rock.
The 1977 eruption
On 10 January 1977, fissures opened on the south flank and drained the lava lake in less than an hour. The flows reached speeds of around 60 km/h on the steep slopes, far faster than people could run. About 600 people died, mostly in villages south of the summit. It is the only known eruption in which lava itself was a major direct killer at those speeds.
The 2002 eruption
On 17 January 2002, fissures again opened on the south flank and sent lava flows into Goma. About 40 percent of the town was destroyed, including the airport runway; some 250 people died and about 350,000 were temporarily displaced into Rwanda. The international response was the largest humanitarian airlift in decades.
The 2021 eruption
On 22 May 2021, eruption began with very little warning. Fissures opened just kilometres from Goma and lava flows stopped at the city's edge. Thirty-two people died. Lake Kivu's potential exposure to a volcanic gas release — a serious low-probability scenario — drove the rapid evacuation that followed.
The Lake Kivu problem
Lake Kivu contains dissolved methane and carbon dioxide in its deep waters at concentrations close to saturation. A large enough disturbance — a major eruption breaching the lake floor, for example — could in principle release the gas catastrophically, in the manner of Lake Nyos in Cameroon in 1986. Engineering to extract the gas for electricity is the current safest answer.
The Goma observatory
The Goma Volcano Observatory monitors Nyiragongo and its near neighbour Nyamuragira. The observatory has been variously starved of funding, shut down by conflict, and reopened; long-term instrumental coverage has therefore been patchy. International support since 2021 has improved this — but Nyiragongo remains under-monitored relative to its risk.
Visiting
Until the early 2020s, guided treks reached the crater rim from Kibati, with overnight stays in shelters on the summit. Security in Virunga National Park has been variable; the route has opened and closed repeatedly. When open, it is one of the most extraordinary volcano-tourism experiences anywhere.
Why Nyiragongo matters
Nyiragongo matters because a million people live within range of a volcano whose lava can outrun them. It matters because Lake Kivu adds a gas-release scenario most volcanoes do not have. And it matters because the monitoring capacity, in a region of long conflict, is far below what the geology demands.
On the map
Open the map and find Nyiragongo just north of Lake Kivu, on the DRC-Rwanda border. Nyamuragira sits to the north, and the broader Virunga chain extends east through Uganda and Rwanda.